Well, I might have spoken too soon. I thought I blew the main seal because I was billowing smoke out of the back. Turns out I might have caught the clogged EHM quick enough to not do any damage. The clogged EHM caused a serious amount of cylinder blow by, causing tons of smoke from the tail pipe. I immediately pulled over and cut the EHM which helped with the smoke a little. Over the next few days, the smoke started to get less and now there is no smoke but my exhaust still smells like burning oil.
There are no oil leaks under my rig, so I'm thinking that I dodged a bullet.
I originally did the EHM years back because my intake hose had deteriorated in one spot where the oil was pooling and a hole had formed.